If the sheet music is in the key of E flat (Eb) major and contains difficult chord shapes, you can transpose it to another major key with easier chord shapes. Keys that contain easy shapes for beginners are C major and G major, or if the song is in a minor key, A minor (Am) or E minor (Em).
Write down the chromatic scale of the key the sheet music is in (usually the first chord is the key chord). Then underneath it write down the chromatic scale of the key you wish to change to. E.g. to change a song from the key of Eb to the key of G, write down the chromatic scale starting with the note Eb and then underneath it write down the chromatic scale starting on the note G.
The letter name of the chord is written on the top line and the letter name of the new chord in the new key (in this case G) will be directly underneath it.
Note that the chord type never changes. If the chord is a minor chord in the key of Eb major it will also be a minor chord in the major key it is transposed to.
The easiest keys for ukulele are:
G major, C major, D major, A major, E major, A minor and E minor. These keys contain chords that are generally easier shapes to hold.